Pillow supplement



FIG. 1 is a top, front, right side perspective view of the design, according to the invention;

FIG. 2 is a bottom, front, right side perspective view of the design of FIG. 1;

FIG. 3 is a top view of the design of FIG. 1;

FIG. 4 is a bottom view of the design of FIG. 1;

FIG. 5 is a front view of the design of FIG. 1;

FIG. 6 is a rear view of the design of FIG. 1;

FIG. 7 is a right side view of the design of FIG. 1;

FIG. 8 is a left side view of the design of FIG. 1; and,

FIG. 9 is a top, front, right side perspective view of the design of FIG. 1, in an environment of use.

Broken lines illustrate environment and form no part of the claimed design. 

CLAIM The ornamental design for a pillow supplement, as shown and described. 